Actuator



FIG. 1 is a perspective view of the actuator;

FIG. 2 is a second perspective view of the actuator;

FIG. 3 is a left side view of the actuator;

FIG. 4 is a top plan view of the actuator;

FIG. 5 is a bottom perspective view of the actuator; and,

FIG. 6 is a top front perspective view of the actuator. 

The ornamental design for an actuator, as shown and described. 